Self-assembly of hierarchical MoSx/CNT nanocomposites (2<x<3): towards high performance anode materials for lithium ion batteries

Abstract

Two dimension (2D) layered molybdenum disulfide (MoS2) has emerged as a promising candidate for the anode material in lithium ion batteries (LIBs). Herein, 2D MoSx (2 ≤ x ≤ 3) nanosheet-coated 1D multiwall carbon nanotubes (MWNTs) nanocomposites with hierarchical architecture were synthesized via a high-throughput solvent thermal method under low temperature at 200°C. The unique hierarchical nanostructures with MWNTs backbone and nanosheets of MoSx have significantly promoted the electrode performance in LIBs. Every single MoSx nanosheet interconnect to MWNTs centers with maximized exposed electrochemical active sites, which significantly enhance ion diffusion efficiency and accommodate volume expansion during the electrochemical reaction. A remarkably high specific capacity (i.e., > 1000 mAh/g) was achieved at the current density of 50 mA g−1, which is much higher than theoretical numbers for either MWNTs or MoS2 along (~372 and ~670 mAh/g, respectively). We anticipate 2D nanosheets/1D MWNTs nanocomposites will be promising materials in new generation practical LIBs.

Electrical, Mechanical, and Capacity Percolation Leads to High-Performance MoS2/Nanotube Composite Lithium Ion Battery Electrodes

“…[20][21][22][23][24][25][26][27][28] Similar approaches involve mixing MoS2 with polyaniline nanowires 29 or carbon nanotubes. 19,[30][31][32] 3 However, the composite electrodes described above remain far from optimised as LIB electrodes. Although such approaches generally result in good capacity and improved stability, the rate capability is still not as good as had been hoped.…”

“…Electrode materials were then mixed with polyacrylic acid (as the binder) in 9:1 weight ratio and dispersed in H2O to form a homogeneous slurry. Subsequently, the slurry was uniformly applied onto a Cu foil, and vacuum dried at 25,27,28,67,68 and MoS2/NT (triangles) [30][31][32] electrodes. The filled stars represent our capacity data (extracted from rate data for the 20 wt% composite), normalised to the total anode…”

In-situ wet tearing based subnanometer MoSeS for efficient hydrogen evolution

“…Raman peaks of MoS 2 centered at 380.5 and 405.7 cm −1 correspond to the in-plane (E 2g ) and out-of-plane Mo-S phonon mode (A 1g ) of typical MoS 2 -layered structure, respectively [50]. It is found that the ratio of A 1g /E 2g of MoS 2 dramatically decrease after the transformation of Ni(OH) 2 into NiSe, further suggesting the increase of the edge defects [51]. What's more, the wavenumber of A 1g peak became smaller after the tearing.…”

Emerging Energy Applications of Two-Dimensional Layered Materials

“…It also attracts prime attention as an auxiliary power source to secondary batteries because of fast charging/discharging capability, high power density, and excellent cyclability as shown in Figure 10. 185 Recent studies demonstrate that MoS 2 nanosheets prepared by hydrothermal method and by exfoliation act as a promising typical pseudocapacitive material for supercapacitor application 184,186 . Having advantages of high conductivity and high surface area, metallic VS 2 nanosheets have been employed to fabricate in plane supercapacitor electrodes 187 .…”